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SportTrac Discussion
Engine & Drivetrain
Procedure for testing fuel pressure with guage kit?
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<blockquote data-quote="scott degroot" data-source="post: 797016" data-attributes="member: 66039"><p>Richard L</p><p></p><p></p><p></p><p>I disagree with your statement that you shouldn't see a drop in pressure if the vehicle has sat overnight. It has been my experience, 20 plus years as an ASE certified master technician with L1 certification, trainer and State of CA advanced emission specialist, that most system will lose quite a bit of pressure if not all if the vehicle has sat overnight. This is usually not a problem as long the fuel hasn't drained out of the line and back into the tank. I just had a car in the shop with a fuel pressure gauge hooked to it overnight to check for extended crank. After I shut the car off fuel pressure held at 50 psi for at least the hour I was there before I went home. Came back the next morning and pressure was down to 15 psi but within 1/2 a second of turning the key on pressure ws back up to 60 psi. The fuel pump turns on for 2 seconds when the key is turned on to prime the system, not the afore mentioned 15 seconds, some systems even run the pump for 2 seconds after the key is shut off to help eliminate vapor lock in the fuel line.</p></blockquote><p></p>
[QUOTE="scott degroot, post: 797016, member: 66039"] Richard L I disagree with your statement that you shouldn't see a drop in pressure if the vehicle has sat overnight. It has been my experience, 20 plus years as an ASE certified master technician with L1 certification, trainer and State of CA advanced emission specialist, that most system will lose quite a bit of pressure if not all if the vehicle has sat overnight. This is usually not a problem as long the fuel hasn't drained out of the line and back into the tank. I just had a car in the shop with a fuel pressure gauge hooked to it overnight to check for extended crank. After I shut the car off fuel pressure held at 50 psi for at least the hour I was there before I went home. Came back the next morning and pressure was down to 15 psi but within 1/2 a second of turning the key on pressure ws back up to 60 psi. The fuel pump turns on for 2 seconds when the key is turned on to prime the system, not the afore mentioned 15 seconds, some systems even run the pump for 2 seconds after the key is shut off to help eliminate vapor lock in the fuel line. [/QUOTE]
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SportTrac Discussion
Engine & Drivetrain
Procedure for testing fuel pressure with guage kit?
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